表明鸦片战争开始与结束的史实分别是（）。 英舰封锁珠江口；英舰列队架炮于南京下关江面。 虎门销烟；中英两国代表在南京议和。 英军进犯天津白河口；道光帝派钦差大臣赴广东和谈。 英舰封锁珠江口；中英签订《南京条约》。
The database instance has the following parameter setting： OS_AUTHENT_PREFIX = OPS$ OS_ROLES = FALSE REMOTE_OS_AUTHENT = FALSE REMOTE_OS_ROLES = FALSE TIMED_OS_STATISTICS = 0 You have a local operating system user SKD.You create a database user OPS$SKD， and then assign external authentication. The user OPS$SKD has theCREATE SESSION privilege. What would you achieve by the above process（） The database user OPS$SKD will be able to administer the database.。 The authentication detail for the database user OPS$SKD is recorded in the password file.。 The local operating system user SKD will be able to access the database instance without specifying theusername and password.。 The database user OPS$SKD has to login with the password of the local operating system user SKD toaccess the database instance.。
了解中学生思维能力与创新能力和实践能力发展的过程与特点，属于（）。
鲜切花一级品要求（）、（）程度很好，成熟度（），具有该品种特性。
You are responsible for managing the database schema for an order entry application in a SQL Server 2005 database. After a design review, a member of the development staff asks you to add a new column named CommissionRate to the Product table. Because the actual commission rates for all products are not known at this time, each product has a default commission rate of 12 percent. The rate can be modified as necessary. You add the new column. You need to configure the table to assign the default value as efficiently as possible. What should you do?（） Create an INSERT trigger to assign the default value to each item in the table. 。 Create a CHECK constraint to validate the data and to assign the default value to each item in the table. 。 Create an UPDATE trigger to update the default value for each new item in the table. 。 Create a DEFAULT constraint to assign the default value specifying the WITH VALUES argument.。
103型分配阀减速弹簧自由高为（）。
